Vulnerability in Kernel (CVE-2025-38351)

Summary

Vulnerability in Kernel (CVE-2025-38351). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 6.6.103, 6.12.41, 6.15.7 or later.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush

In KVM guests with Hyper-V hypercalls enabled, the hypercalls
HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST and HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX
allow a guest to request invalidation of portions of a virtual TLB.
For this, the hypercall parameter includes a list of GVAs that are supposed
to be invalidated.

However, when non-canonical GVAs are passed, there is currently no
filtering in place and they are eventually passed to checked invocations of
INVVPID on Intel / INVLPGA on AMD. While AMD's INVLPGA silently ignores
non-canonical addresses (effectively a no-op), Intel's INVVPID explicitly
signals VM-Fail and ultimately triggers the WARN_ONCE in invvpid_error():

invvpid failed: ext=0x0 vpid=1 gva=0xaaaaaaaaaaaaa000
WARNING: CPU: 6 PID: 326 at arch/x86/kvm/vmx/vmx.c:482
invvpid_error+0x91/0xa0 [kvm_intel]
Modules linked in: kvm_intel kvm 9pnet_virtio irqbypass fuse
CPU: 6 UID: 0 PID: 326 Comm: kvm-vm Not tainted 6.15.0 #14 PREEMPT(voluntary)
RIP: 0010:invvpid_error+0x91/0xa0 [kvm_intel]
Call Trace:
vmx_flush_tlb_gva+0x320/0x490 [kvm_intel]
kvm_hv_vcpu_flush_tlb+0x24f/0x4f0 [kvm]
kvm_arch_vcpu_ioctl_run+0x3013/0x5810 [kvm]

Hyper-V documents that invalid GVAs (those that are beyond a partition's
GVA space) are to be ignored. While not completely clear whether this
ruling also applies to non-canonical GVAs, it is likely fi…

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2025-38351 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 6.6.103, 6.12.41, 6.15.7 or later.
If unsure, ask your IT team or search "Kernel CVE-2025-38351" on the vendor's site.

CVE-2025-38351 (Kernel)
Patched: 6.6.103, 6.12.41, 6.15.7 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in Kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 6.6.103, 6.12.41, 6.15.7.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Kernel' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'Kernel' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Kernel を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade Kernel to 6.6.103, 6.12.41, 6.15.7
```
ステージング環境で 6.6.103, 6.12.41, 6.15.7 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.41"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.15.7"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2025-38351 linux-lts Fixed in: 6.12.41-r0
Debian DEBIAN-CVE-2025-38351 linux Fixed in: 6.12.41-1
Ubuntu UBUNTU-CVE-2025-38351 linux-hwe-edge